[#EVP_MAC_CTX_get_block_size]
= EVP_MAC_CTX_get_block_size
:mrdocs:

Return the MAC block size for the algorithm bound to `ctx.`

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t
EVP_MAC_CTX_get_block_size(xref:EVP_MAC_CTX.adoc[EVP_MAC_CTX]* ctx);
----

== Return Value

Block size in bytes, or 0 if unavailable.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Initialized MAC context.
|===


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